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I want to say that while the Insight's engine can crank out ~67HP at 6000rpm, it's probably only making around 22HP with the throttle wide open at 2000rpm. The 2004 Prius 1.5L is ~76HP at 5000rpm, so you're looking at a little over 30HP at 2000.
Check out the Base Specific Fuel Consumption thread for info on throttle position vs efficiency.
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